std::ranges::drop_while_view<V,Pred>::drop_while_view

 

C++

Language

Standard Library Headers

Freestanding and hosted implementations

Named requirements

Language support library

Concepts library (C++20)

Diagnostics library

Utilities library

Strings library

Containers library

Iterators library

Ranges library (C++20)

Algorithms library

Numerics library

Localizations library

Input/output library

Filesystem library (C++17)

Regular expressions library (C++11)

Atomic operations library (C++11)

Thread support library (C++11)

Technical Specifications

 

Ranges library

Range access
begin cbegin end cend	rbegin crbegin rend crend	size ssize data cdata	empty
Range primitives
iterator_tsentinel_t	range_size_trange_difference_t	range_value_t	range_reference_trange_rvalue_reference_t
Dangling iterator handling
dangling	borrowed_iterator_t	borrowed_subrange_t
Range concepts
range borrowed_range sized_range	common_range view viewable_range	input_range output_range forward_range	bidirectional_range random_access_range contiguous_range
Views
view_interface	subrange
Semiregular wrapper
Factories
empty_viewviews::empty	single_viewviews::single	iota_viewviews::iota	views::counted
Adaptors
views::all_tviews::all join_viewviews::join take_viewviews::take basic_istream_viewistream_view	ref_view                                split_viewviews::split take_while_viewviews::take_while elements_viewviews::elements	common_viewviews::common transform_viewviews::transform drop_viewviews::drop keys_viewviews::keys	reverse_viewviews::reverse filter_viewviews::filter drop_while_viewviews::drop_while values_viewviews::values

 

std::ranges::drop_while_view

Member functions

drop_while_view::drop_while_view

drop_while_view::base

drop_while_view::pred

drop_while_view::begin

drop_while_view::end

Deduction guides

 

drop_while_view() = default;	(1)	(since C++20)
constexpr drop_while_view( V base, Pred pred );	(2)	(since C++20)

Constructs a drop_while_view.

1) Default constructor. Value-initializes the underlying view and the predicate. If Pred is not default_initializable, the drop_while_view does not hold a predicate, and subsequent use of the predicate (e.g. call of begin) is undefined behavior.

2) Move constructs the underlying view from base and the predicate from pred.

Parameters

base	-	underlying view
pred	-	predicate

Example

Run this code

#include <array>
#include <iostream>
#include <ranges>
 
int main()
{
    constexpr std::array data{ 0, -1, -2, 3, 1, 4, 1, 5, };
 
    auto view = std::ranges::drop_while_view{
        data, [](int x) { return x <= 0; }
    };
 
    for (int x: view) {
        std::cout << x << ' ';
    }
    std::cout << '\n';
}

Output:

3 1 4 1 5